Runway Incursion: How To Stay Safe on the Ground

Runway incursions remain one of aviation's biggest safety threats. Learn the ICAO categories, root causes, real statistics, and what every pilot can do to stay safe on the ground

March 31st, 2026

Runway Status Light System (RWSL) - Photo: FAA

This week, a collision at LaGuardia Airport reminded the aviation community that an active runway is one of the most dynamic and unforgiving operational environments.

While the investigation is ongoing and no conclusions should be drawn prematurely, the tragedy has reignited an important alert: runway incursions remain one of commercial and general aviation's most persistent safety challenges.

According to FAA runway safety data, hundreds of runway incursions are reported in the United States every year. The deadliest accident in aviation history was itself a runway incursion. In 1977, two Boeing 747s collided on the runway at Tenerife, killing 583 people. That was 1977. The same fundamental risk exists today.

This article breaks down what runway incursions are, how they're categorized, where they come from — and what every pilot can do to reduce the risk every time they taxi.

What Is a Runway Incursion?

"Runway Incursion is any occurrence at an aerodrome involving the incorrect presence of an aircraft, vehicle or person on the protected area of a surface designated for the landing and take-off of aircraft." (ICAO definition)

In plain terms: when anything or anyone that shouldn't be on an active runway — is on it. It doesn't require a near-collision to qualify. A runway incursion occurs when a pilot taxis onto the wrong taxiway, misses a hold-short instruction, or enters a runway without clearance — even if no other aircraft is nearby.

The Four Severity Categories

Not all runway incursions carry the same risk. ICAO classifies them into four categories based on proximity to collision:

• Category A — A serious incident where a collision was narrowly avoided.

  
  

• Category B — Significant potential for collision. Separation decreases to a point where an evasive response becomes critical.

  
  

• Category C — Ample time and/or distance to avoid a collision.

  
  

• Category D — Meets the definition of a runway incursion, but with little or no immediate safety consequence. Incorrect presence, no collision risk.

The vast majority of reported incursions fall into Category C or D. The less comfortable truth: a high number of low-severity events indicates systemic vulnerabilities that, under different conditions, could escalate.

Where Do Runway Incursions Come From?

The FAA categorizes root causes into three groups:

• Pilot Deviations (PD) — The most common cause. A flight crew fails to comply with ATC instructions, misreads a runway diagram, or misidentifies a taxiway as a runway. Loss of situational awareness on complex airport surfaces is the primary driver.

  
  

• Vehicle/Pedestrian Deviations (V/PD) — Ground vehicles, maintenance crews, or airport workers enter protected areas without authorization. Particularly hazardous at night or in low visibility.

  
  

• Operational Errors (OE) — ATC issues instructions that create a conflict — authorizing an aircraft to take off or land while another occupies the runway.

Complex and busy airports amplify all three risks. These environments require a level of surface situational awareness that rivals the demands of instrument flight in IMC.

Prevention is Key

What every pilot can do to stay safe on the ground:

1. Briefings. Study the airport diagram before pushback. If anything changes, brief it again. Discuss the hotspots and build mitigation strategies to enhance situational awareness when near them. At unfamiliar airports, request progressive taxi — there is no professional penalty for asking.

   
   

2. Communication. Read back all runway-crossing and hold-short instructions. Full readback. Every time. Abbreviated acknowledgements are where misunderstandings and incursions begin.

   
   

3. Sterile cockpit. The concept doesn't begin at 10,000 feet — it begins the moment you push back. Minimize non-essential communication during taxi at complex airports. In a multi-crew flight deck, verbalize to the other pilots every time you go heads-down to focus on another task.

   
   

4. Airport Diagram. Always have the airport diagram displayed. If you have an Airport Moving Map and ADS-B traffic advisory on your EFB, use it actively. New technologies have fundamentally changed surface navigation. Use them progressively, not just as a backup.

   
   

5. Leadership. Speak up. Clarify any ambiguous instructions. If a clearance is unclear, ask. ATC expects it. A two-second clarification prevents a lifetime of consequences. If you are not sure you are going in the right direction — stop. If you are not the pilot on the controls, speak up.

   
   

6. Workload Management. A flight crew can become task-saturated in seconds during ground operations — an ATC call, re-clearances, runway and departure changes, final weights and performance calculations. If you find yourself struggling to divide your attention between any side-task and the taxi, buy extra time: reduce taxi speed or ask ATC for a position to hold. When crossing runways, stop any tasks or checklists, and give full attention to taxi route and airport environment. Aircraft movement always gets priority.

   
   

7. Cognitive bias. Human factors pose a significant threat during last-minute changes. When we brief a procedure, we build an execution plan, and an expectation — and the brain tends to protect that initial plan. In case anything changes at the last minute, our mind can be tricked by what's called expectation bias: a cognitive phenomenon where pilots or air traffic controllers see, hear, or interpret information based on what they expect to happen rather than what is actually occurring. Therefore, when facing a last-minute change, revisit your standard operating procedure and carefully verify each pilot's tasks using the appropriate checklist. Protect yourself from your own cognitive bias.

Fatigue, Currency, Proficiency, and the Bigger Picture

There's a dimension to runway safety that goes beyond individual procedures: pilot awareness, proficiency and currency. Pilots who are current, rested, and cognitively sharp are better equipped to maintain situational awareness in dynamic surface environments. Fatigue and high-traffic airports are a high-risk combination.

Technology Is Catching Up

The human factors challenge is real, but technology can help to close the gap. The FAA is deploying Runway Status Lights (RWSL) — an automated system that uses real-time surveillance data to illuminate red stop bars independently of ATC — at 74 airports by end of 2026, with early data showing a 72% reduction in incursions where the system is already active.

Meanwhile, ALPA is pressing Congress to mandate ADS-B In — cockpit traffic display technology that shows surrounding aircraft in real time — closing a gap that has contributed to multiple recent close calls. The tools exist. The mandate is the missing piece. Until every aircraft operating in shared airspace is both broadcasting and receiving, the pilot's scan and the controller's radar remain the primary barrier between a routine taxi and a Category A event.

The Ground Is Where It Starts

The runway environment is unforgiving because it's where multiple aircraft, vehicles, and people converge in real time, with tight tolerances and high consequences.

The LaGuardia accident is a reminder that the work of enhancing flight safety never stops — in the air or on the ground.

One of the most underutilized layers of runway safety is peer intelligence — what pilots who flew into that airport yesterday actually encountered on the surface. Wader's AI Airport Briefs aggregate crowd-sourced threat reports from the pilot community.

Check it out at: logbook.waderaviation.com

For pilots, the discipline begins before engine start. It lives in the sterile-cockpit, briefings, readbacks, communication, and self-awareness. The same mental resources that manage a complex approach in IMC are equally taxed on the ground. No rush – carefully identify threats and set mitigation strategies for every ground operation.

Safe flights,

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